<?php

class Living
{
  function getAge()
  {
    return 500;
  }
}

class Human extends Living
{
  //function getAge()
  //{
    //return 65;
  //}
}

class Boy extends Human
{
  //function getAge()
  //{
    //return 25;
  //}

}

$parth = new Boy;
echo $parth->getAge();
